The PROTEC B2S 12.5 series of over-voltage surge protective devices has been developed to protect against partial direct and indirect lightning discharges and is intended to provide protection in zones 0A - 1, per IEC 62305. PROTEC B2S 25 (1+1) combines a PROTEC B2S 12.5 and PROTUBE B2S to provide protection for TT single phase networks, where N to PE galvanic isolation is required.

The PROTEC B2S 12.5 series of over-voltage surge protective devices has been developed to protect against partial direct and indirect lightning discharges and is intended to provide protection in zones 0A - 1, per IEC 62305. PROTEC B2S 50 (3+1) combines three PROTEC B2S 12,5 units and a PROTUBE B2S, to provide protection for TT three phase networks, where N and PE galvanic isolation is required.